A reinforced concrete beam is 240 mm wide and 450 mm deep to the centre of the reinforcing steel rods. The rods are of total cross-sectional area 1.2 x mz and the maximum allowable stresses in the steel and concrete are 150 MN/mZ and 8 MN/m2 respectively. The modular ratio (steel :concrete) is 16. Determine the moment of resistance of the beam.